This pull request is a complete rewrite of the provider using the terraform plugin framework.
This PR brings a full feature parity with the current provider master branch.

The migration to the plugin framework requires go 1.22+ and terraform 1.1+.

At the same time I implemented some new features:

• Add datasources whenever it is possible/relevant (see documentation)
• Deprecate attributes that can be replaced by lists in membership resources. This will allow to group multiple membership attributes (users, hosts, groups etc...) into a single resource. This will reduce drastically the number of api calls made on freeipa.
• Better resource update logic and detection of modifications made to the infrastructure outside of the terraform state.
• Add support for freeipa v4.12. ccin2p3 being not very reactive and still on v4.6, I use my own fork that. could be move to Roman's of course.

Considering the scale of changes here, it might require to release beta releases of the provider, and obviously it requires a lot of testing.

Still missing: Migration from previous versions (based on plugin-sdkv2) require that a released version build against the latest version of ths plugin-sdk is released. Testing functions for that will have to be implemented once said release is available

Fixes #31, fixes #36